Concept

Expansive clay

Publications associées (21)

Gas injection tests on a Sand Bentonite Mixture: Investigation on the effects of pore water chemistry

Lyesse Laloui, Alessio Ferrari, Donatella Manca, Mohammad Monfared

In this study a series of swelling and breakthrough tests were performed on a target S/B mixture in proportion 80/20 in dry mass. Tests were carried out on specimen compacted to the same dry density but changing the osmotic suction of the pore water. The t ...

2013

Mechanisms of degradation of concrete by external sulfate ions under laboratory and field conditions

Aude Chabrelie

The durability of concrete is a major challenge for the construction, which devotes one third to one half of its annual investment to building maintenance. The lack of field data regarding concrete durability, especially in the case of exposure to sulfate ...

EPFL2010

Composite Hydrogels for the Replacement of the Nucleus Pulposus

Ana Borges de Couraça

The intervertebral disc (IVD), which provides flexibility to the spine and facilitates damping and motion, is composed of two distinct structures: the annulus fibrosus (AF) and the nucleus pulposus (NP). The AF, which is fibrous and elastic, confines the N ...

EPFL2010

Release kinetics of volatiles from smectite clay minerals

Pascal Clausen

The focus of this thesis was on the mechanisms of release of volatile molecules from smectite clay minerals. The weight loss was monitored by thermogravimetry, differential calorimetry, and mass spectrometry under isothermal conditions and under ramp tempe ...

EPFL2009

Adsorption of low-molecular-weight molecules on the surface of a sodium smectite clay: an ab initio study

John Christopher Plummer, Wanda Andreoni, Pascal Clausen, Alessandro Curioni

We present a study of the adsorption of single molecules of volatiles, such as water, ethanol, ethyl acetate, pyridine, toluene, and n-octane, on the dry surface of a smectite clay using a series of calculations based on density functional theory. Our clay ...

2009

Water adsorption on a sodium smectite clay surface: an ab initio study

John Christopher Plummer, Pascal Clausen

Using calculations based on density-functional theory, we explore the configurations that water molecules (2,3,4;6) assume on the surface a sodium 2:1 smectite clay with isomorphic substitutions both on octahedral and tetrahedral sheets. The hydrophilicity ...

2009

Deformation and fracture in isotactic polypropylene glass mat thermoplastic composites modified with montmorillonite clay

John Christopher Plummer, Sara Dalle Vacche, Chrystèle Houphouet-Boigny Favre

Satisfactory impregnation of glass fiber mats may be obtained with isotactic polypropylene/montmorillonite (MMT) nanocomposites under conditions comparable with industrial conditions. However, it is demonstrated here that the high melt viscosity of the nan ...

2008

Impact of small amounts of swelling clays on the physical properties of debris-flow-like granular materials. Implications for the study of alpine debris flow

Paul Bowen, Pascal Boivin, Eric Bardou

The effect of the small fraction of clays on the rheological behaviour of alpine debris flow is poorly understood. This is partly due to the complexity of the debris flow mineralogy and the broad particle size distribution. This study has investigated this ...

2007

Correlating the rheological and mechanical response of polyurethane nanocomposites containing hyperbranched polymers

John Christopher Plummer, Marlene Rodlert

Cast polyurethane thermosets have been modified with randomly oriented exfoliated and intercalated montmorillonite clay usinghyperbranched polymers (HBP) as reactive additives to promote dispersion of the clay platelets. The influence of the clay content o ...

2005

Valorisation des boues de lavage de gravière dans le domaine du stockage d'eau potable, d'eau chaude et de la rétention de substances polluantes

The present study on the recovery of gravel washing muds is placed in the context of geology applied to engineering and environment, which is a field of research done at the Laboratory of Geology (GEOLEP) of the Swiss Federal Institute of Technology in Lau ...

EPFL1994

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